header {
  width: 100%;
}

nav {
  width: 10%;
  float: left;
}

nav ul {
  list-style-type: none; 
}

footer {
  width: 100%;
  clear: both;
  text-align: center;
}

footer ul {
  list-style-type: none;
}

footer ul li {
  display: inline;
}

section#main {
  width: 90%;
  float: right;
  text-align: center;
  padding: auto;
}
